Patent GB-384382-A (GB)
Title: Improvements in connection with electric heating elements and in the manufacture of t
IPC: H05B3/16
Filed: 1931-09-21
Abstract: 384,382. Wire resistances. MUSGRAVE, J. L., 43, Bloomsbury Square, FOWLER. L. J.. 20B, Anerley Park, and CRITTALL & CO., Ltd., R., 43, Bloomsbury Square, both in London. Sept. 21, 1931, No. 26340. [Class 37.] Heating panels, particularly for attachment to the walls or ceiling of a building, consist of thin resistance wire A, Fig. 2, insulated or not, arranged in zig-zag formation on a sheet of paper, linen, &c. B, drawn from a roll, over which another sheet of paper, also drawn from a roll, is stuck by an adhesive so that the wires A are held in position between the two sheets. The panels are then subjected to pressure, with or without heat. Conductors or bus-bars D may be fixed along the sides of the panels, and may consist of metal tape which may be punched with eyelets for facilitating connection. Pins or pointed pegs el, Fig. 4, are fixed on each side of a movable table E, the lower sheet of paper, linen, &c. B being drawn from the roll and passed between rollers on to the table and penetrated by the pins. The wire A is then wound on the pins, and the conductors or bus-bars, if used, are arranged along the ends of the sheet Band soldered or connected up where necessary. Adhesive is then applied and the upper sheet B<1>, as it is drawn from the roll, is laid in position, which may be effected by passing the two sheets between rollers so that the wires are held in position between the sheets B, B<1>, the pins being withdrawn as this part of the operation proceeds. The completed panel is then passed through rolls, preferably heated, the edges then being trimmed. Instead of pins, hooks f<1>, Fig. 5, carried by removable or slidable arms F may be provided, the hooks being turned to release the wires when required. The hooks f<1> may be fixed on bands, which move along each side of the table at the same speed. In a further modification, Fig. 7, a frame H is provided with pins h<1> and with revoluble rollers or drums J carrying staples j<1>. The resistance wire A is wound between the staples j<1> and is held in the frame H by threads h<2> passed over the pins h<1>, the bus-bars D also being held in the frame. The rollers J are then turned inwardly to withdraw the staples j<1> from the wire, leaving it suspended by the threads h<2>. The frame H is then placed over the lower sheet, as it is drawn from the roll, which sheet has previously been treated with adhesive, and the upper sheet, as it is drawn from the roll, is placed in position. The threads h<2> are cut to release the sheets from the frame. Or the frame may be formed with travelling bands carrying the staples on which the wires are wound, the staples being withdrawn as the bands travel along. The sheets of paper may be treated to render them fireproof. An insulating medium may be incorporated either by impregnation or by stretching a layer of insulating material on one or both sides of the element. The panel may be attached to a ceiling or wall, the remaining portion of which is afterwards covered with paper, linen, leather, &c. of similar thickness.